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TC820CPL Arkusz danych(PDF) 6 Page - Microchip Technology |
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TC820CPL Arkusz danych(HTML) 6 Page - Microchip Technology |
6 / 28 page TC820 DS21476B-page 6 © 2002 Microchip Technology Inc. 2.0 PIN DESCRIPTIONS Thedescriptionsof the pins arelistedinTable2-1. TABLE 2-1: PIN FUNCTION TABLE Pin Number (40-PDIP) Pin Number (44-PQFP) Symbol Description 1 40 L-E4 LCD segment driver for L ("logic LOW"), polarity, and "e" segment of most significant digit (MSD). 2 41 AGD4 LCD segment drive for "a," "g," and "d" segments of MSD. 3 42 BC4P3 LCD segment drive for "b" and "c" segments of MSD and decimal point 3. 4 43 HFE3 LCD segment drive for H ("logic HIGH"), and "f" and "e" segments of third LSD. 5 44 AGD3 LCD segment drive for "a," "g," and "d" segments of third LSD. 6 1 BC3P2 LCD segment drive for "b" and "c" segments of third LSD and decimal point 2. 7 2 OFE2 LCD segment drive for "over range," and "f" and "e" segments of second LSD. 8 3 AGD2 LCD segment drive for "a," "g," and "d" segments of second LSD. 9 4 BC2P1 LCD segment drive for "b " and "c" segments of second LSD and decimal point 1. 10 5 PKFE1 LCD segment drive for "hold peak reading," and "f" and "e" segments of LSD. 11 6 AGD1 LCD segment drive for "a," "g," and "d" segments of LSD. 12 7 BC1BT LCD segment drive for "b" and "c" segments of LSD and "low battery." 13 8 BP3 LCD backplane #3. 14 9 BP2 LCD backplane #2. 15 10 BP1 LCD backplane #1. —11 VDISP Sets peak LCD drive signal: VPEAK =(VDD)– VDISP.VDISP mayalso beusedto compensate for temperature variation of LCD crystal threshold voltage. 16 12 DGND Internal logic digital ground, the logic "0" level. Nominally 4.7V below VDD. 17 13 ANNUNC Square-wave output at the backplane frequency, synchronized to BP1. ANNUNC can be used to control display annunciators. Connecting an LCD segment to ANNUNC turns it on; connecting it to its backplane turns it off. 18 14 LOGIC Logic mode control input. When connected to VDD, the converter is in Logic mode. The LCD displays "OL" and the decimal point inputs control the HIGH and LOW annunciators. When the "low" annunciator is on, the buzzer will also be on. When unconnected or con- nected to DGND, the TC820 is in the Voltage/Frequency Measurement mode. This pin has a 5 µA internal pull-down to DGND. 19 15 RANGE/ FREQ Dual purpose input. In Range mode, when connected to VDD, the integration time will be 200 counts instead of 2000 counts 20 16 DP0/LO Dual purpose input. Decimal point select input for voltage measurements. In logic mode, connecting this pin to VDD will turn on the "low" LCD segment. There is an internal 5µA pull-down to DGND in Volts mode only. Decimal point logic: DP1 DPQ Decimal Point Selected 00 None 01 DP1 10 DP2 11 DP3 21 17 DP1/HI Dual purpose input. Decimal point select input for voltage measurements. In Logic mode, connecting this pin to VDD will turn on the "high" LCD segment. There is an internal 5µA pull-down to DGND in Volts mode only. 22 18 BUZOUT Buzzer output. Audio frequency, 5kHz, output which drives a piezoelectric buzzer. 23 19 BUZIN Buzzer control input. Connecting BUZIN to VDD turns the buzzer on. BUZIN is logically OR’ed (internally) with the "logic level low" input. There is an internal 5 µApull-down to DGND. 24 20 FREQ/ VOLTS Voltage or frequency measurement select input. When unconnected, or connected VOLTS to DGND, the A/D converter function is active. When connected to VDD,the frequency counter function is active. This pin has an internal 5 µA pull-down to DGND. |
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